增加转格式

lib/convert/converters.js

@@ -0,0 +1,31 @@
+import { spawnSync } from "child_process";
+import path from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const ASSIMP_PATH = path.join(__dirname, "../../bin/assimp.exe");
+
+let importExts = null;
+let exportFormats = null;
+
+export function getImportExtensions() {
+  if (!importExts) {
+    const r = spawnSync(ASSIMP_PATH, ["listext"], { encoding: "utf8" });
+    importExts = r.stdout.trim().split(";").map(e => e.replace("*", "").toLowerCase());
+  }
+  return importExts;
+}
+
+export function getExportFormats() {
+  if (!exportFormats) {
+    const r = spawnSync(ASSIMP_PATH, ["listexport"], { encoding: "utf8" });
+    exportFormats = r.stdout.trim().split(/\r?\n/).filter(Boolean);
+  }
+  return exportFormats;
+}
+
+export async function convert(inputFile, outputFile, format, cwd = process.cwd()) {
+  const r = spawnSync(ASSIMP_PATH, ["export", inputFile, outputFile, `-f${format}`], { encoding: "utf8", cwd });
+  if (r.status !== 0) throw new Error(r.stderr || r.stdout || "转换失败");
+  return outputFile;
+}